What I might consider if I were you would be to connect up with something like XDrive. It's a virtual drive that you can both connect to on the web. the'll give you so much space for free, anything more they charge. I don't know what the limit isbut you may want to check it out. There are several companies that provide this kind of service. What you can do is open up your browser and do a search on "Internet & Drive" this should give you a pretty good listing. What you do once you've signed up is that you map a "virtual" drive on both of your computers. Then anytime that either of you are connected to the internet you can both access the file. This can also be a problem if you are using a large file, as your connection speeds willmean that you may have to wait a few minutes to download and upload the file all the time. If you are both using high speed connections this might not be a big deal. Also you may run into issues where both of you are trying to upload the file at the same time. These are just a couple of things to keep in mind.
Good luck with whatever you do,
-Mike